Including external jar files to resource path in Rhino shell - jar

Question

I am using javascript on a Rhino Shell. I need to add the com.sun.jna.jar to the classpath. Now when I type - js:> Packages.com.sun.jna.NativeLibrary
[JavaClass com.sun.jna.NativeLibrary]
This shows that the jna library is accessible by the Rhino Shell? But when I try to use the library: js:> var c=Packages.com.sun.jna.NativeLibrary.getInstance("c");
java.lang.UnsatisfiedLinkError: Unable to load library '2': JNA native support (win32-x86/2.dll) not found in resource path (C:\ti\ccsv5\eclipse\plugins/org.eclipse.equinox.launcher_1.3.0.v20120522-1813.jar)
The resource path(C:\ti\ccsv5......launcher_1.3.0.v20120522-1813.jar) is the path it shows when I type - js:> print(System.getProperty("java.class.path"));
I donot understand how to add the jar files to the resource path.I tried to do it by the Command prompt: java -cp "path of jar" .name of class containing main ---> How do I understand what is the name of the class containing main since Rhino does the conversion from javascripts to classes?
Thanks in Advance.
Sohini.

Answer 1

I don't believe that the issue is specifically related to Rhino. Rather, it is a difference between the Linux and Windows system libraries.
The getting started document for JNA, at
https://github.com/twall/jna/blob/master/www/GettingStarted.md provides the following example:
package com.sun.jna.examples;
import com.sun.jna.Library;
import com.sun.jna.Native;
import com.sun.jna.Platform;
/** Simple example of JNA interface mapping and usage. */
public class HelloWorld {
// This is the standard, stable way of mapping, which supports extensive
// customization and mapping of Java to native types.
public interface CLibrary extends Library {
CLibrary INSTANCE = (CLibrary)
Native.loadLibrary((Platform.isWindows() ? "msvcrt" : "c"),
CLibrary.class);
void printf(String format, Object... args);
}
public static void main(String[] args) {
CLibrary.INSTANCE.printf("Hello, World\n");
for (int i=0;i < args.length;i++) {
CLibrary.INSTANCE.printf("Argument %d: %s\n", i, args[i]);
}
}
}
The native library loaded depends on the platform you are running the program on: For Windows you will need to use the 'msvcrt' (Microsoft Visual C Run Time) library; for others, use the 'c' library.
I ran a test case to confirm:
Running on Windows fails if I try to load the "c" library.
PS C:\Users\jharig\workspace\JNATest> java -cp ".\jna-3.5.2.jar;.\platform-3.5.2.jar;.\js.jar;.\js-14.jar" org.mozilla.javascript.tools.shell.Main
Rhino 1.7 release 4 2012 06 18
js> var c = Packages.com.sun.jna.NativeLibrary.getInstance("c");
Exception in thread "main" java.lang.UnsatisfiedLinkError: Unable to load library 'c': JNA native support (win32-amd64/c
.dll) not found in resource path (.\jna-3.5.2.jar;.\platform-3.5.2.jar;.\js.jar;.\js-14.jar)
at com.sun.jna.NativeLibrary.loadLibrary(NativeLibrary.java:220)
at com.sun.jna.NativeLibrary.getInstance(NativeLibrary.java:322)
Running on Windows succeeds if I use the 'msvcrt' library.
PS C:\Users\jharig\workspace\JNATest> java -cp ".\jna-3.5.2.jar;.\platform-3.5.2.jar;.\js.jar;.\js-14.jar" org.mozilla.javascript.tools.shell.Main
Rhino 1.7 release 4 2012 06 18
js> var c = Packages.com.sun.jna.NativeLibrary.getInstance("msvcrt");
js> var f = c.getFunction("printf");
js> f.invoke(["Hello World\n"]);
Hello World
js>